The eBay weight has tall, quite thick peaks rising from a low ground and the aventurine is large and covers the peaks as well as the ground. The whole thing looks very chunky (and I think the ground is black, not blue).

The peaks in mine and Christine's weights are worked with more finesse into a fine, flattened effect and contain whisps of white, adding to the delicacy of the whole pattern. The ground fills over half the weight.